An acrylic process off gas treatment device temperature control system
By combining the tail gas recirculation treatment module and the reaction heat removal module, and using the circulating fan and blower to regulate the tail gas temperature, the problem of insufficient control and adjustment margin of the reaction temperature in the acrylic acid process tail gas treatment device is solved, achieving safe and stable temperature control, avoiding catalyst damage, and improving the system's operational flexibility and safety.
Patent Information
- Application Number
- CN202422946491.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-29
AI Technical Summary
Currently, the reaction temperature control scheme of acrylic acid process tail gas treatment equipment has limited room for adjustment, which leads to a decrease in catalyst activity. Especially when the concentration of organic tail gas suddenly increases, it is difficult to maintain the reaction temperature within a safe range.
The system employs the synergistic effect of a tail gas recirculation treatment module and a reaction heat removal module. Through the cooperation of a circulating fan and a blower, the system uses a superheater and an electric heater to regulate the tail gas temperature. Combined with a frequency converter to control the air volume, the system ensures that the tail gas temperature is within a safe range. Heat management is achieved using a waste heat boiler and a tail gas heater.
Effective control of reaction temperature prevents catalyst overheating and burnout, improves system safety and operational flexibility, ensures exhaust gas temperature is within a safe range, and enhances the system's temperature regulation capability.
Smart Images
Figure CN223610140U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to acrylic process tail gas treatment technical field, concretely is acrylic process tail gas treatment device temperature control system. BACKGROUND
[0002] At present, the acrylic process tail gas treatment device uses catalytic combustion method. Its main principle is to use catalyst to reduce the reaction activation energy, so that the organic matter is flameless combustion on the surface of the catalyst at a lower temperature (250-400 DEG C), and the organic matter in the exhaust gas is decomposed into O2 and H2O. But a large amount of heat is generated in the reaction, and this part of heat needs to be transferred through a reasonable control scheme, so that the reaction is in a safe and stable temperature range, otherwise the reaction cannot continue, and even the catalyst is burned out.
[0003] At present, the reaction temperature control scheme has limited adjustment margin, and if the organic tail gas concentration suddenly increases or the organic tail gas suddenly increases in actual production, the reaction temperature will continue to be in a high temperature state, and the catalyst activity will inevitably decrease for a long time. UTILITY MODEL CONTENT
[0004] In view of the defects of the prior art, the utility model provides an acrylic process tail gas treatment device temperature control system, which solves the problem of limited adjustment margin of the reaction temperature control scheme at present.
[0005] To achieve the above purpose, the utility model provides the following technical scheme: an acrylic process tail gas treatment device temperature control system, comprising:
[0006] A tail gas circulation treatment module;
[0007] A reaction heat removal module is connected in parallel to the tail gas circulation treatment module and participates in the tail gas treatment;
[0008] A tail gas flow regulation path is constructed between the tail gas circulation treatment module and the reaction heat removal module and regulates the tail gas to flow in a single direction;
[0009] The reaction heat removal module comprises a circulating fan connected to the tail gas circulation treatment module and participating in the tail gas flow, and the circulating fan is connected in parallel to the tail gas regulation path of the air blower.
[0010] In one embodiment, the tail gas circulation treatment module comprises a tail gas preheater that receives process tail gas, the tail gas preheater is connected to a pipeline that delivers to the circulating fan, the tail gas preheater is connected to a delivery channel that collects the output tail gas of the circulating fan and connects the tail gas flow regulation path, the delivery channel is connected to an electric heater, and the output pipeline of the electric heater is connected to a first reactor and simultaneously connected to the tail gas flow regulation path;
[0011] The first reactor is connected with a superheater one, and the tail gas is transported to the second reactor and a superheater two through the superheater one.
[0012] In one of the embodiments, the superheater two and the superheater one both include a body and a coil pipe arranged in the body, and the coil pipe is provided with fins for increasing the heat dissipation area.
[0013] In one of the embodiments, the tail gas flow circulation adjustment passage includes a supply passage one and a supply passage two connected with the air blower, and the supply passage one and the supply passage two are connected with the air outlet pipe of the air blower.
[0014] In one of the embodiments, the air outlet pipe is provided with an adjusting valve at the connection point of the supply passage one and the supply passage two to adjust the air volume of the conveying path.
[0015] In one of the embodiments, the output end of the superheater two is connected with a waste heat boiler and a tail gas heater connected in parallel, and the process tail gas is collected in the tail gas preheater after being output from the waste heat boiler or the tail gas heater and is output to the chimney.
[0016] Compared with the prior art, the temperature control system of the acrylic acid process tail gas treatment device has the following beneficial effects:
[0017] In the technical scheme disclosed in the utility model, under the synergistic action of the reaction heat removal module and the tail gas flow circulation adjustment passage, the heat exchange of the incoming air and the tail gas after reaction is controlled, the temperature adjustability of the tail gas after reaction under heat exchange or not is maintained, in addition, the tail gas after reaction is circulated to the system by the circulating fan, the total tail gas amount of the system is improved, the system temperature rise can be effectively reduced, the operating conditions are relaxed, and the reaction temperature is controlled in a safe range.
[0018] By arranging the superheater two at the output end of the second reactor, the heat exchange of the high-temperature tail gas through the coil pipe can be realized, the temperature of the tail gas is reduced, the temperature of the steam is increased, the saturated steam is changed into superheated steam, the output tail gas temperature can be effectively adjusted, and the temperature adjustment degree is increased. BRIEF DESCRIPTION OF DRAWINGS
[0019] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the application without imposing undue limitation thereon. In the drawings:
[0020] Figure 1 It is a whole schematic view of the temperature control system of the utility model;
[0021] Figure 2 It is a tail gas circulation treatment module schematic view of the utility model;
[0022] Figure 3 It is the schematic view of reaction heat removal module of the utility model;
[0023] Figure 4 It is the schematic view of tail gas flow circulation adjustment passage and air supply passage two connection of the utility model;
[0024] Figure 5 It is the schematic view of tail gas flow circulation adjustment passage and air supply passage one connection of the utility model.
[0025] In the figure: 1, tail gas circulation processing module;11, tail gas preheater;12, conveying passage;13, electric heater;14, first reactor;15, superheater one;16, second reactor;17, superheater two;18, coil;19, tail gas heater;2, reaction heat removal module;21, circulating fan;22, air blower;3, tail gas flow circulation adjustment passage;31, air outlet pipe;32, air supply passage one;33, air supply passage two. Specific implementation
[0026] The implementation of the present application will be described in detail below with the help of the accompanying drawings and examples, so that the realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
[0027] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.
[0028] Figures 1-5For an embodiment of the utility model, the specific problem of the embodiment is that: currently, the acrylic acid process tail gas treatment device uses catalytic combustion method. Its main principle is to use catalyst to reduce the reaction activation energy, so that the organic matter is flameless combustion on the surface of the catalyst at a lower temperature (250-400 DEG C), and the organic matter in the exhaust gas is decomposed into O2 and H2O. But a large amount of heat will be generated in the reaction, and this part of heat needs to be transferred through a reasonable control scheme, so that the reaction is in a safe and stable temperature range, otherwise the reaction cannot continue, even the catalyst is burned out by flying temperature. At present, the reaction temperature control scheme has limited adjustment margin, and if the concentration of organic tail gas suddenly increases or the amount of organic tail gas suddenly increases in actual production, the reaction temperature will continue to be in a high temperature state, and the catalyst activity will inevitably decrease for a long time. In view of the subsequent problems caused by the limited adjustment margin of the above reaction temperature control scheme, the scheme describes an acrylic acid process tail gas treatment device temperature control system, which controls the heat exchange of the incoming air and the tail gas after reaction under the synergistic action of the reaction heat removal module 2 and the tail gas flow adjustment path 3, maintains the temperature adjustability of the tail gas after reaction under whether heat exchange, in addition, the reaction after the tail gas is circulated to the system by using the circulating fan 21, the total tail gas amount of the system is improved, which can effectively reduce the system temperature rise, the operation condition is loose, and the reaction temperature is controlled in the safe range.
[0029] An acrylic acid process tail gas treatment device temperature control system, comprising: the tail gas circulating treatment module 1 first carries out the tail gas into the system and basic processing, and the reaction heat removal module 2 is connected in parallel on the circulating track of the tail gas circulating treatment module 1 and is used for controlling the reaction temperature, the tail gas flow adjustment path 3 constructs the connection between the tail gas circulating treatment module 1 and the reaction heat removal module 2 and adjusts the tail gas to flow in a single direction, the reaction heat removal module 2 includes the circulating fan 21 connected with the tail gas circulating treatment module 1 and participating in the tail gas flow, and the tail gas adjustment path connected with the air blower 22 in parallel is connected with the path of the tail gas gathered to the tail gas circulating treatment module 1 by the circulating fan 21.
[0030] The tail gas circulation processing module 1 comprises a tail gas preheater 11 receiving process tail gas, the tail gas preheater 11 is connected with a pipeline conveying to a circulating fan 21, the tail gas preheater 11 is connected with a conveying channel 12 collecting the tail gas output by the circulating fan 21 and connecting the tail gas flow passage adjusting channel 3, the conveying channel 12 is connected with an electric heater 13, the output pipeline of the electric heater 13 is connected with a first reactor 14 and simultaneously connected with the tail gas flow passage adjusting channel 3, the first reactor 14 is connected with a superheater one 15, the tail gas is conveyed to a second reactor 16 and a superheater two 17 through the superheater one 15. The superheater two 17 comprises a body and a coil 18 arranged in the body, the superheater one 15 and the superheater two 17 have the same arrangement structure, the coil 18 in the superheater one 15 inputs saturated steam 3.0 Mpa, the coil 18 in the superheater two 17 inputs saturated steam 1.8 Mpa, the coil 18 is provided with fins for increasing the heat dissipation area, the fins and the coil 18 can exchange heat when the high-temperature tail gas passes through the coil 18, so that the temperature of the tail gas is reduced and the temperature of the steam is increased, the saturated steam becomes superheated steam, that is, the output tail gas temperature can be effectively adjusted and the temperature adjustment degree is increased. The output end of the superheater two 17 is connected with a waste heat boiler and a tail gas heater 19 connected in parallel, the process tail gas is output to a chimney after being output from the waste heat boiler or the tail gas heater 19 and being collected in the tail gas preheater 11.
[0031] The tail gas flow circulation adjustment passage 3 comprises a first air supply passage 32 and a second air supply passage 33 connected with the air blower 22, the first air supply passage 32 and the second air supply passage 33 are connected with the air outlet pipe 31 of the air blower 22, and the connecting points of the air outlet pipe 31 with the first air supply passage 32 and the second air supply passage 33 are provided with an adjusting valve for adjusting the air volume. The first air supply passage 32 is connected with the connecting channel of the tail gas heater 19 between the tail gas preheater 11 and the electric heater 13, and the second air supply passage 33 is connected with the delivery channel 12 of the electric heater 13 for delivering the tail gas to the first reactor 14. Based on the oxygen participation required by the reaction, the air blower 22 is arranged to deliver oxygen into the system, and the two air supply passages are designed so that, after the air enters the first air supply passage 32, the air can enter the tail gas heater 19 for heat exchange simultaneously with the delivery of the tail gas heater 19, thereby reducing the temperature of the tail gas and preheating control. The air blower 22 is controlled by a frequency converter, and if the reaction temperature is high, the air volume can be increased by frequency conversion to reduce the temperature in the reactor. When the organic tail gas concentration suddenly increases or the amount of organic tail gas suddenly increases and the heat exchange of the first air supply passage 32 cannot reduce the reaction temperature to a safe range, the outlet of the air blower 22 can be switched to the second air supply passage 33 to directly enter the inlet of the first reactor 14. The adjusting valve can be quickly switched, and the temperature at the inlet of the reactor can be greatly reduced, thereby reducing the temperature in the reactor. In the present scheme, the air blower 22 and the circulating blower 21 are simultaneously faulted, and the two are interlocked into the SIS system. The circulating blower 21 forces the tail gas to enter the system. Since the tail gas contains part of the oxygen (5%-7%), if the air blower 22 fails, part of the oxygen in the reaction system can still be used for catalytic incineration. At this time, the air blower 22 or the standby blower can be started in time, avoiding the false shutdown caused by instrument failure and other factors, and improving the reliability of the system safety instrument.
[0032] The control mode of the utility model is automatically controlled through the controller, the control circuit of the controller can be realized through simple programming of the person skilled in the art, the power supply also belongs to the public knowledge in the field, and the utility model is mainly used for protecting the mechanical device, so the control mode and the circuit connection of the utility model will not be explained in detail.
[0033] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.
[0034] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An acrylic process off-gas treatment device temperature control system, characterized by, The application relates to a tail gas circulation treatment module (1), a reaction heat removal module (2) connected in parallel with the tail gas circulation treatment module (1) and participating in tail gas treatment, a tail gas flow circulation adjustment channel (3) connecting the tail gas circulation treatment module (1) and the reaction heat removal module (2) and adjusting the tail gas to flow in a single direction. The reaction heat removal module (2) comprises a circulating fan (21) connected with the tail gas circulation treatment module (1) and participating in tail gas circulation, and the circulating fan (21) is connected with a tail gas adjustment channel of a blower (22) in parallel. The tail gas circulation treatment module (1) comprises a tail gas preheater (11) receiving process tail gas, the tail gas preheater (11) is connected with a pipeline conveying to the circulating fan (21), the tail gas preheater (11) is connected with a conveying channel (12) collecting the output tail gas of the circulating fan (21) and connecting the tail gas flow circulation adjustment channel (3), the conveying channel (12) is connected with an electric heater (13), the output pipeline of the electric heater (13) is connected with a first reactor (14) and simultaneously connected with the tail gas flow circulation adjustment channel (3). The first reactor (14) is connected with a superheater (15), and the tail gas passes through the superheater (15) and is conveyed to a second reactor (16) and a superheater (17). The superheater (17) and the superheater (15) both comprise a body and a coil pipe (18) arranged in the body, and the coil pipe (18) is provided with fins for increasing the heat dissipation area.
2. An acrylic process off-gas treatment device temperature control system as defined in claim 1, wherein: The tail gas flow circulation adjustment channel (3) comprises a first air supply channel (32) and a second air supply channel (33) connected with the blower (22), and the first air supply channel (32) and the second air supply channel (33) are both connected with an air outlet pipe (31) of the blower (22). The air outlet pipe (31) is connected with the first air supply channel (32) and the second air supply channel (33) at a connection point, and an adjusting valve is arranged on the air outlet pipe (31) to adjust the air volume of the conveying path.
3. An acrylic process off-gas treatment device temperature control system as defined in claim 2, wherein: The output end of the superheater (17) is connected with a waste heat boiler and a tail gas heater (19) connected in parallel, and the process tail gas is collected in the tail gas preheater (11) after being output from the waste heat boiler or the tail gas heater (19) and is output to a chimney.
4. An acrylic process off-gas treatment device temperature control system as defined in claim 1, wherein: 5. An acrylic process off-gas treatment device temperature control system as defined in claim 4, wherein: 6. An acrylic process off gas treatment device temperature control system as claimed in claim 3, wherein: